Sound post



` J. W. MCGRATH, JR.

SOUND POST.

APPLlcATloN man Nov.6.1s2o.

1,408,707, Patented Mar. 7, 1922.

JOHN WILLIAM MCSE/ATH. JR.,

OF BROOKHA'VEN, MISSISSIPPI.

SOUND POST.

Speciicaton of Letters Patent.

Patented Mar. '7, 1922.

Application filed November 6, 1920. Serial No. 422,221.

To all whom t may conce/fn:

Be it known that l, JOHN W. MCGRATH, J r., citizen ot theUnited States, and resident oi? Brookhaven, in the county of Lin coln and State of Mississippi, have invented a new and Improved Sound Post., or. which the following is a full, clear, and exact description.

My invention relates to a sound post and aims to provide new and usetul improve ments in connection with a device of this character,

ln this connection it is aimed to provide a. sound post which will, as in the case of tie prior application, enhance the `resonancy ot the tone of the instrument in that the vibration of the bass bar will be continued by means oi the same ior a much longer period. l

An object oit this invention is to provide a sound post which will serve to permit of more vibration being imparted to the essential parts of the instrument.

5r further object ot my invention is the construction of a. sound post or instrument attachment, which will give the proper quah ity oi? vibration, in that a vibration results when the tone is produced, which will. be carried over a greater period than has heretofore been possible.

Reference is had to the attachedv sheet of drawings, as illustrating` one practical einbodiment ot my invention, and in which- Figure l shows one practical embodiment of my invention, in that the attachment is shown associated with a violin, the latter being illustrated in cross section.

Figure 2 is an enlarged side view ot the attachment, and

Figure 3 is an end vie-w thereof.

ln these views the reference numeral 5 indicates the hollow body of the instrument. which in the form illustrated is provided with a bridge 6, a sound post embodying my improved attachment, beine` interposed between the back and belly or the instrument.

`Referring now more particularly to Fign ures 2 and 3, it will be seen that l provide a vsound post, including sections 7 and S, which may be of any desirable material, the outer ends oi" which Contact with the inner faces of the back and belly ot the instrument, the inner ends of these sections being spaced one from the other, as has been clearly indicated.

)low with a view of providing means which will produce Yimproved 'tonal quality, a spring ,9 is interposed between the spaced inner ends ot the sound post sections 7 and S. In the form illustrated the spring is shown as substantially U shaped, which is to be preferred, and it will be noted that the sound post sections contact with the same substantially adjacent its ends.

lt will be appreciated that any vibration imparted to one of the strings will be trans mitted t-o the body ot the instrument, and thence to the sound post section 7 and by means of the spring, the vibration set up will pass into the. section 8, and so be communicated to the opposite section of the body ot the instrument.

T o now also incorporate means which will serve to lengthen the vibratory period, it is to be noted that the ends oit the spring 9, in the embodiment illustrated, are extended, as has been indicated by the reference numeral l0. The outer ends of these extended portions niay conveniently project rearwardly and mount weighted portions 1l.

lt will be obvious that upon the post sections 7 and 8 being vibrated in the manner specified. that this vibration will be. transmitted by 'virtue ot the extended portions l() ot the attachment to the weights 11, which 'will serve to enhance its vibratory effect.

rThus l have provided an attachment in the nature ot a sound post, which will embody improved construction over prior devices in that the resilient qualities ot the sound post will be enhanced thus allowing` more viln'ation. lt will also be understood that by virtue o'i" the weighted portions ll. mounted upon the extended portions 10, that the vibrations will be apparent over a longer period, thus i'orcing7 the same.

Obviously numerous modifications of structure might readily be resorted to wit-hout in the least departing trom the spirit ot my invention. l claim as my inventionl. 'n sound post, including a pair of body portions, having their inner ends spaced from each other, and resilient means interposed and engaging said inner ends, and weights attached to said resilient means.

2. A sound post, including a pair of sections having their inner ends spaced trom one another, a spring` interposed between and engaging the inner ends of said sections, extendedportions attached to the ends oi' said springs, and weighted portions se- 4. A sound post, including a pair of sections having their inner ends spaced one from the other, a U shaped spring, the inner ends of said sections engaging and being 15 attached to the spring adjacent the ends of the saine, extended portions projecting beyond the ends of said spring, the outer ends of said extended portions being bent rearwardly, and weighted portions secured 2 to such outer ends.

JOHN WILLIAM MOGRATH, J R. 

